Servlet配置文件模板 web.xml
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<!-- 根據servlet規範，需要將servlet部署到web.xml文件 -->
<servlet>
<!-- servlet-name 給該servlet去個名字，默認使用Servlet的名字 -->
<servlet-name>MyFirstServlet</servlet-name>
<!-- servlet-class 要指明該servelt放在哪個包下 -->
<servlet-class>com.wucheng.day01.MyFirstServlet</servlet-class>
</servlet>
<!-- servlet 的映射 -->
<servlet-mapping>
<!-- servlet-name 名字要與上面的一樣 -->
<servlet-name>MyFirstServlet</servlet-name>
<!-- url-pattern 資源定位，這裏就是將來訪問該Servlet的資源名部分 -->
<url-pattern>/MyFirstServlet</url-pattern>
</servlet-mapping>
</web-app>
Servelt類
public class MyHttpServlet extends HttpServlet{
//在HttpServlet中，設計者對post提交和get提交分別處理
//默認是get提交
//doGet() doPost()都去調用了service方法
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("--doGet()..--");
response.getWriter().println("i am httpServlet doGet()");
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("--doPost()..--");
response.getWriter().println("i am httpServlet doPost()" + request.getParameter("username"));
}
}HTML頁面
<html>
<head>
<title>login.html</title>
</head>
<body>
<form action="/ServletWeb/MyHttpServlet" method="Post">
username:<input type="text" name="username" />
<input type="submit" value="登陸" />
</form>
</body>
</html>
